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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment of Loans Based on Impairment Method (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Individually evaluated for impairment	$ 499		$ 94
Collectively evaluated for impairment	7,816		7,405
Total ending allowance balance	8,315	$ 7,639	7,499	$ 7,313	$ 6,952	$ 7,699
Loans individually evaluated for impairment	10,942		18,108
Loans collectively evaluated for impairment	771,435		751,211
Total ending loans balance	782,377		769,319
Residential Portfolio Segment [Member]
Individually evaluated for impairment	409
Collectively evaluated for impairment	2,023		1,470
Total ending allowance balance	2,432	1,886	1,470	1,431	1,300	939
Loans individually evaluated for impairment	926		1,420
Loans collectively evaluated for impairment	304,388		307,743
Total ending loans balance	305,314		309,163
Commercial Real Estate Portfolio Segment [Member]
Individually evaluated for impairment	90		94
Collectively evaluated for impairment	2,355		2,884
Total ending allowance balance	2,445	2,392	2,978	2,960	2,813	4,315
Loans individually evaluated for impairment	4,289		7,333
Loans collectively evaluated for impairment	214,256		206,113
Total ending loans balance	218,545		213,446
Commercial and Industrial Portfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment	1,383		1,024
Total ending allowance balance	1,383	1,242	1,024	972	932	907
Loans individually evaluated for impairment	5,727		9,154
Loans collectively evaluated for impairment	110,762		97,935
Total ending loans balance	116,489		107,089
Consumer Portfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment	2,055		2,027
Total ending allowance balance	2,055	$ 2,119	2,027	$ 1,950	$ 1,907	$ 1,538
Loans individually evaluated for impairment			201
Loans collectively evaluated for impairment	142,029		139,420
Total ending loans balance	$ 142,029		$ 139,621

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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The balance of financing receivables that were collectively evaluated for impairment.

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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 11B
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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